Tried Something

[JMD]

Tried carving on a curve. Oak slab from sawmill.

[scottp55]

NICE:)
Now you got me wanting to try it
How did you decide on Z origin?
scott

[JMD]

Now you got me wanting to try it
How did you decide on Z origin?
scott[/quote]

First figured out the radius of the slab. Then laid out an oval dish shape and put the bear in it. Hard to explain. Think it was more luck than anything.
Drew shape of slab, end view, then put the radius of dish shape over it and adjusted until I though it would fit. I am sure that there is a way to do this with math, but that is a little past what I can do. Hope this helps. And sorry I can't be more help.
John

[scottp55]

Thanks for the .crv and the explantion John!
scott

[Chuck26287]

First figured out the radius of the slab. Then laid out an oval dish shape and put the bear in it. Hard to explain. Think it was more luck than anything.
Drew shape of slab, end view, then put the radius of dish shape over it and adjusted until I though it would fit. I am sure that there is a way to do this with math, but that is a little past what I can do. Hope this helps. And sorry I can't be more help.
John

I've never tried it before, but would this have been an application for setting the Z-origin reference at the bottom of the workpiece instead of the top?

[PaulRowntree]

That looks good, and the bark works well with the design. How will you keep the bark on the slab ?

[martin54]

Love projects like this that are a bit different from the normal, especially when you have to try & figure out where to put the piece on the table to get the machine to cut where you want. Thanks for sharing. I did a cake topper for someone a while ago where I had to do something along the same lines.

That looks good, and the bark works well with the design. How will you keep the bark on the slab ?

Paul I did some centre pieces for my daughters wedding 2 years ago, she wanted them to look natural but I was worried that the bark would start falling off before the wedding. Covered them with a matt varnish which did darken then a little but it still looked pretty natural & the bark didn't start falling off. In fact they are still the same now as I have a couple of them in the workshop

[JMD]

First figured out the radius of the slab. Then laid out an oval dish shape and put the bear in it. Hard to explain. Think it was more luck than anything.
Drew shape of slab, end view, then put the radius of dish shape over it and adjusted until I though it would fit. I am sure that there is a way to do this with math, but that is a little past what I can do. Hope this helps. And sorry I can't be more help.
John

I've never tried it before, but would this have been an application for setting the Z-origin reference at the bottom of the workpiece instead of the top?

Never tried setting the Z-origin to the bottom. Not sure you can do that with a CNC SHARK. Machine always goes to 0,0,0 at the start of a cut.

[JMD]

[quote][/quote]
That didn't work like I planed

[JMD]

That looks good, and the bark works well with the design. How will you keep the bark on the slab ?

Never though about that. When my son-in-law's father, a wood turner, gets back from FL I wisk ask him about that. I did give it 2 costs of sprat poly. That might do something.

[scottp55]

JMD,
In my experience, IF the wood is dry and the bark is tight...it stays tight.
Both these pieces were KD 18 years ago and it's still tight except 2" on left of the moose blank(but the rest of the bark is keeping it in place).
And the Moose had been stuck in a 140F oven for an hour after carving to let linseed/beeswax saturate it.
I've got a bark on slab table 20 yrs old and that is still tight as well(all pics Maple though).
2 cents,
scott

[BillK]

I've done this a few times. What I do to get the curve close is figure out how wide my carving is going to be and then round up another inch. So in this case say 4 inches. Mark out the 4 inches on the end of the log or round and measure up to the edge below the bark. Then use the arc tool to draw that with your measurements, do a two rail sweep for the length, and add your carving. Hope that helps.

[JMD]

I've done this a few times. What I do to get the curve close is figure out how wide my carving is going to be and then round up another inch. So in this case say 4 inches. Mark out the 4 inches on the end of the log or round and measure up to the edge below the bark. Then use the arc tool to draw that with your measurements, do a C for the length, and add your carving. Hope that helps.

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Thanks Bill K, but do not have the two rail sweep in VCarve Pro8. That would make things a lot easier.

[BillK]

Very good point. But before I had Aspire, I did the same with Sketchup and cut 3d.

[JMD]

Very good point. But before I had Aspire, I did the same with Sketchup and cut 3d.

I will have to look into that. Thanks.